Standard Test Method for Analysis of Carbon and Low-Alloy Steel by Spark Atomic Emission Spectrometry – ASTM E Standard Number, ASTM E – Title, Standard Test Method for Analysis of Carbon and Low-Alloy Steel by Spark Atomic Emission. Designation: E − 15Standard Test Method for Contact ASTM Customer Standards volume information, refer to the standard’s Document Summary page.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
It is designed for either chill-cast asrm rolled and forged specimens. The reference materials and specimens should be of similar metallurgical condition and composition. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. B Quantitative range in accordance with Practice E NOTE 1—The concentration ranges of the elements listed have been established through cooperative testing2 of reference materials.
Included, in addition to the original data of Test Method E — 71, are data from cooperative testing of a broader range of reference materials to expand the element concentration ranges. The specimen asmt should be between 10 and 38 mm. Current edition approved Nov. Originally published as E — Last previous edition E — Summary of Test Method 4. The absorption of the radiation by air in this region is overcome by evacuating the spectrometer and?
A capacitor discharge is produced between the? The discharge is terminated at a predetermined intensity time integral of a selected iron line, or at a predetermined time, and the relative radiant energies or concentrations of the analytical lines are recorded. It is assumed that all who use this test method will be analysts capable of performing common laboratory procedures skillfully satm safely. It is expected that work will be performed in a properly equipped laboratory.
Refer to Practice E for steel sampling procedures. The following mold types have been found to produce acceptable samples: The wall thickness of the mold is approximately 32 mm 11? The ring is placed on a? The spark chamber shall be mounted directly on the spectrometer, and shall be provided with a spark stand to hold a?
NOTE 2—Clean the excitation chamber when the counter electrode is replaced. Clean the lens or protective window after approximately to excitations to minimize transmission losses. Masks shall be provided in the spectrometer to eliminate scattered radiation. The spectrometer shall be provided with an air inlet and a vacuum outlet.
The spectrometer shall be operated at a vacuum of 25? The primary slit width is 20 to 50? Secondary slit width is 50 to ? NOTE 3—A pump with ast, displacement of at least 0.
Automatic sequencing shall be provided to actuate the? Means of changing the?
Reagents and Materials 7. NOTE 4—A black deposit builds up on the asgm of the electrode, thus reducing the overall intensity of the spectral radiation. In general this condition will not affect analytical performance for the? The number of acceptable excitations on an electrode varies from one instrument asgm another, and should be established in each asttm. With a thoriated tungsten electrode, it has been reported that a hundred or more excitations can usually be made before replacement.
These cover all or part of the concentration ranges listed in 1. They are valuable in establishing preliminary working curves and determining the precision of the instrument. However, because of differences between these CRMs and the production specimens prepared by the sampling procedures recommended for this test method, curves based on CRMs may in very unusual circumstances need to be corrected with values sstm reference materials made by normal production sampling techniques and analyzed in accordance with Test Methods E 30, Eand E e4115 For this purpose, veri?
These reference materials shall be homogeneous and contain appropriate amounts of each element, covering the concentration range of elements contained in the specimens. Its approximate range shall s415 from Preparation of Specimens and Reference Materials 9.
Cut a 13 to mm 1? Make certain that the specimens are homogeneous and free from voids and pits in the region to be excited Note 5. Rough grind the cut surface by grinding on a belt surfacer, either wet or dry, with 50 to grit abrasive belt.
The specimen surface should be kept clean because the specimen is the electron emitter, and electron emission is inhibited by oily, dirty surfaces. Asgm 6—Reference materials and atsm shall be re? Preparation of Apparatus NOTE 7—The instructions given herein apply to most spectrometers; however, some settings and adjustments may need to be varied, and additional preparation of the equipment may be required.
It is not within the scope of an ASTM test method to prescribe the minute details of the apparatus preparation which may differ not only for each manufacturer, but also for different equipment from the same manufacturer.
NOTE 8—The lines listed in Table 1 have proven satisfactory for the elements and concentration ranges described in the scope. Other internal standard and analytical lines, such as those listed in Table 2, may be used provided that it e451 be shown experimentally that equivalent precision and accuracy are obtained.
B Interferences are dependent upon instrument design, spectrum line choices, and excitation conditions, and those listed require con? This shall be done initially and as often as necessary thereafter to maintain proper alignment. NOTE 9—The manner and frequency of positioning or checking the position of the exit slits will depend on factors such as: Each laboratory should establish a suitable check procedure.
Excitation and Exposure B Interferences are dependent upon instrument design, dispersion, spectrum line choices, and excitation conditions, and those listed require con? NOTE 10—When parameter values are established, maintain them carefully. Nominal values found to be adequate are listed as follows: H Resistance, V Satm voltage, V residual 2. Once established, maintain the parameters consistently.
NOTE 12—A high-purity argon atmosphere is required at the analytical gap. Molecular gas impurities, nitrogen, oxygen, hydrocarbons, or water vapor, ast in the gas system or from improperly prepared specimens should be minimized.
Make the necessary corrections either by adjusting the controls on the readout or by applying arithmetic corrections. E45 will be done anytime veri? If results do not fall within the control limits established in If readings are not in conformance, repeat the standardization. Excitation and Radiation Measurements NOTE 14—With certain spectrometers, a properly excited specimen usually exhibits a dark ring around the pitted sparked area. With that equipment, a smooth, white, texture burn without the characteristic dark ring indicates an improperly excited specimen.
However, if boron nitride disks are asfm to mechanically restrict the excited area of the sample, a properly excited specimen may not exhibit a dark ring.
ASTM E415 – 17
Use either a 3, 4, or 5-mm Center the analytical gap on the optical axes of the spectrometer. Condition a fresh counter electrode with two to six excitations using the operating conditions in accordance with NOTE 13—The range of anode to cathode potentials e4415 a given tube should be speci? If within the potential range the tube is either too sensitive or too insensitive for the element concentration range, select another photomultiplier. The potentials on the capacitors may be read directly, or a number of different readout systems may be employed which yield linear s415 logarithmic functions of the potentials and which may be displayed as relative numbers or as numbers calibrated directly in terms of percent.
Precision and Bias Additional data for withinlaboratory variability of results, obtained by analyzing three specimens of one material in seven laboratories in accordance with source conditions speci? Other specimens may exhibit greater or less variability using the same instrument and excitation conditions. Calibration, Standardization, and Veri?
There shall be at least three calibrants for each element, spanning the required concentration range. Repeat with different random sequences at least two times.
Using the averages of the data for each point, determine analytical curves as directed in Practices E and E The data are given in Table 7 Note Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
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